<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    Mage
 * @package     Mage_Catalog
 * @copyright   Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
/** @var $installer Mage_Catalog_Model_Resource_Setup */
$installer = $this;
$connection = $installer->getConnection();

$installer->startSetup();

$entityTypeId = $installer->getEntityTypeId(Mage_Catalog_Model_Category::ENTITY);
$attributeId = $installer->getAttributeId($entityTypeId, 'filter_price_range');
$attributeTableOld = $installer->getAttributeTable($entityTypeId, $attributeId);

$installer->updateAttribute($entityTypeId, $attributeId, 'backend_type', 'decimal');

$attributeTableNew = $installer->getAttributeTable($entityTypeId, $attributeId);

if ($attributeTableOld != $attributeTableNew) {
    $connection->disableTableKeys($attributeTableOld)
        ->disableTableKeys($attributeTableNew);

    $select = $connection->select()
        ->from($attributeTableOld, array('entity_type_id', 'attribute_id', 'store_id', 'entity_id', 'value'))
        ->where('entity_type_id = ?', $entityTypeId)
        ->where('attribute_id = ?', $attributeId);

    $query = $select->insertFromSelect($attributeTableNew,
        array('entity_type_id', 'attribute_id', 'store_id', 'entity_id', 'value')
    );

    $connection->query($query);

    $connection->delete($attributeTableOld,
        $connection->quoteInto('entity_type_id = ?', $entityTypeId)
            . $connection->quoteInto(' AND attribute_id = ?', $attributeId)
    );

    $connection->enableTableKeys($attributeTableOld)
        ->enableTableKeys($attributeTableNew);
}

Mage::getModel('index/indexer')
    ->getProcessByCode('catalog_category_flat')
    ->changeStatus(Mage_Index_Model_Process::STATUS_REQUIRE_REINDEX);

$installer->endSetup();
